isa_irqhandler.c revision 1.24
1 /* $NetBSD: isa_irqhandler.c,v 1.24 2009/03/18 10:22:36 cegger Exp $ */ 2 3 /* 4 * Copyright 1997 5 * Digital Equipment Corporation. All rights reserved. 6 * 7 * This software is furnished under license and may be used and 8 * copied only in accordance with the following terms and conditions. 9 * Subject to these conditions, you may download, copy, install, 10 * use, modify and distribute this software in source and/or binary 11 * form. No title or ownership is transferred hereby. 12 * 13 * 1) Any source code used, modified or distributed must reproduce 14 * and retain this copyright notice and list of conditions as 15 * they appear in the source file. 16 * 17 * 2) No right is granted to use any trade name, trademark, or logo of 18 * Digital Equipment Corporation. Neither the "Digital Equipment 19 * Corporation" name nor any trademark or logo of Digital Equipment 20 * Corporation may be used to endorse or promote products derived 21 * from this software without the prior written permission of 22 * Digital Equipment Corporation. 23 * 24 * 3) This software is provided "AS-IS" and any express or implied 25 * warranties, including but not limited to, any implied warranties 26 * of merchantability, fitness for a particular purpose, or 27 * non-infringement are disclaimed. In no event shall DIGITAL be 28 * liable for any damages whatsoever, and in particular, DIGITAL 29 * shall not be liable for special, indirect, consequential, or 30 * incidental damages or damages for lost profits, loss of 31 * revenue or loss of use, whether such damages arise in contract, 32 * negligence, tort, under statute, in equity, at law or otherwise, 33 * even if advised of the possibility of such damage. 34 */ 35 36 /* 37 * Copyright (c) 1994-1998 Mark Brinicombe. 38 * Copyright (c) 1994 Brini. 39 * All rights reserved. 40 * 41 * This code is derived from software written for Brini by Mark Brinicombe 42 * 43 * Redistribution and use in source and binary forms, with or without 44 * modification, are permitted provided that the following conditions 45 * are met: 46 * 1. Redistributions of source code must retain the above copyright 47 * notice, this list of conditions and the following disclaimer. 48 * 2. Redistributions in binary form must reproduce the above copyright 49 * notice, this list of conditions and the following disclaimer in the 50 * documentation and/or other materials provided with the distribution. 51 * 3. All advertising materials mentioning features or use of this software 52 * must display the following acknowledgement: 53 * This product includes software developed by Mark Brinicombe 54 * for the NetBSD Project. 55 * 4. The name of the company nor the name of the author may be used to 56 * endorse or promote products derived from this software without specific 57 * prior written permission. 58 * 59 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 60 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 61 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 62 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 63 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 64 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 65 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 66 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 67 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 68 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 69 * 70 * IRQ/FIQ initialisation, claim, release and handler routines 71 * 72 * from: irqhandler.c 73 * 74 * Created : 30/09/94 75 */ 76 77 #include <sys/cdefs.h> 78 __KERNEL_RCSID(0, "$NetBSD: isa_irqhandler.c,v 1.24 2009/03/18 10:22:36 cegger Exp $"); 79 80 #include <sys/param.h> 81 #include <sys/systm.h> 82 #include <sys/syslog.h> 83 #include <sys/malloc.h> 84 85 #include <uvm/uvm_extern.h> 86 87 #include <machine/intr.h> 88 #include <machine/irqhandler.h> 89 #include <machine/cpu.h> 90 91 irqhandler_t *irqhandlers[NIRQS]; 92 93 u_int current_mask; 94 u_int actual_mask; 95 u_int disabled_mask; 96 u_int irqmasks[NIPL]; 97 98 /* Prototypes */ 99 100 extern void set_spl_masks(void); 101 void irq_calculatemasks(void); 102 void stray_irqhandler(u_int); 103 104 #define WriteWord(a, b) *((volatile unsigned int *)(a)) = (b) 105 106 /* 107 * void irq_init(void) 108 * 109 * Initialise the IRQ/FIQ sub system 110 */ 111 112 void 113 irq_init(void) 114 { 115 int loop; 116 117 /* Clear all the IRQ handlers and the irq block masks */ 118 for (loop = 0; loop < NIRQS; ++loop) { 119 irqhandlers[loop] = NULL; 120 } 121 122 /* 123 * Setup the irqmasks for the different Interrupt Priority Levels 124 * We will start with no bits set and these will be updated as handlers 125 * are installed at different IPL's. 126 */ 127 for (loop = 0; loop < NIPL; ++loop) 128 irqmasks[loop] = 0; 129 130 current_mask = 0x00000000; 131 disabled_mask = 0x00000000; 132 actual_mask = 0x00000000; 133 134 set_spl_masks(); 135 136 /* Enable IRQ's and FIQ's */ 137 enable_interrupts(I32_bit | F32_bit); 138 } 139 140 141 /* 142 * int irq_claim(int irq, irqhandler_t *handler) 143 * 144 * Enable an IRQ and install a handler for it. 145 */ 146 147 int 148 irq_claim(int irq, irqhandler_t *handler, const char *group, const char *name) 149 { 150 151 #ifdef DIAGNOSTIC 152 /* Sanity check */ 153 if (handler == NULL) 154 panic("NULL interrupt handler"); 155 if (handler->ih_func == NULL) 156 panic("Interrupt handler does not have a function"); 157 #endif /* DIAGNOSTIC */ 158 159 /* 160 * IRQ_INSTRUCT indicates that we should get the irq number 161 * from the irq structure 162 */ 163 if (irq == IRQ_INSTRUCT) 164 irq = handler->ih_num; 165 166 /* Make sure the irq number is valid */ 167 if (irq < 0 || irq >= NIRQS) 168 return(-1); 169 170 /* Make sure the level is valid */ 171 if (handler->ih_level < 0 || handler->ih_level >= NIPL) 172 return(-1); 173 174 /* Attach evcnt */ 175 evcnt_attach_dynamic(&handler->ih_ev, EVCNT_TYPE_INTR, NULL, 176 group, name); 177 178 /* Attach handler at top of chain */ 179 handler->ih_next = irqhandlers[irq]; 180 irqhandlers[irq] = handler; 181 182 /* 183 * Reset the flags for this handler. 184 * As the handler is now in the chain mark it as active. 185 */ 186 handler->ih_flags = 0 | IRQ_FLAG_ACTIVE; 187 188 /* 189 * Record the interrupt number for accounting. 190 * Done here as the accounting number may not be the same as the 191 * IRQ number though for the moment they are 192 */ 193 handler->ih_num = irq; 194 195 irq_calculatemasks(); 196 197 enable_irq(irq); 198 set_spl_masks(); 199 return(0); 200 } 201 202 203 /* 204 * int irq_release(int irq, irqhandler_t *handler) 205 * 206 * Disable an IRQ and remove a handler for it. 207 */ 208 209 int 210 irq_release(int irq, irqhandler_t *handler) 211 { 212 irqhandler_t *irqhand; 213 irqhandler_t **prehand; 214 215 /* 216 * IRQ_INSTRUCT indicates that we should get the irq number 217 * from the irq structure 218 */ 219 if (irq == IRQ_INSTRUCT) 220 irq = handler->ih_num; 221 222 /* Make sure the irq number is valid */ 223 if (irq < 0 || irq >= NIRQS) 224 return(-1); 225 226 /* Locate the handler */ 227 prehand = &irqhandlers[irq]; 228 irqhand = *prehand; 229 230 while (irqhand && handler != irqhand) { 231 prehand = &irqhand->ih_next; 232 irqhand = *prehand; 233 } 234 235 /* Remove the handler if located */ 236 if (irqhand) 237 *prehand = irqhand->ih_next; 238 else 239 return(-1); 240 241 /* The handler has been removed from the chain so mark it as inactive */ 242 irqhand->ih_flags &= ~IRQ_FLAG_ACTIVE; 243 244 /* Make sure the head of the handler list is active */ 245 if (irqhandlers[irq]) 246 irqhandlers[irq]->ih_flags |= IRQ_FLAG_ACTIVE; 247 248 evcnt_detach(&irqhand->ih_ev); 249 250 irq_calculatemasks(); 251 252 /* 253 * Disable the appropriate mask bit if there are no handlers left for 254 * this IRQ. 255 */ 256 if (irqhandlers[irq] == NULL) 257 disable_irq(irq); 258 259 set_spl_masks(); 260 261 return(0); 262 } 263 264 /* adapted from .../i386/isa/isa_machdep.c */ 265 /* 266 * Recalculate the interrupt masks from scratch. 267 * We could code special registry and deregistry versions of this function that 268 * would be faster, but the code would be nastier, and we don't expect this to 269 * happen very much anyway. 270 */ 271 void 272 irq_calculatemasks(void) 273 { 274 int irq, level; 275 irqhandler_t *ptr; 276 int irqlevel[NIRQS]; 277 278 /* First, figure out which levels each IRQ uses. */ 279 for (irq = 0; irq < NIRQS; irq++) { 280 int levels = 0; 281 for (ptr = irqhandlers[irq]; ptr; ptr = ptr->ih_next) 282 levels |= 1 << ptr->ih_level; 283 irqlevel[irq] = levels; 284 } 285 286 /* Then figure out which IRQs use each level. */ 287 for (level = 0; level < NIPL; level++) { 288 int irqs = 0; 289 for (irq = 0; irq < NIRQS; irq++) 290 if (irqlevel[irq] & (1 << level)) 291 irqs |= 1 << irq; 292 irqmasks[level] = ~irqs; 293 } 294 295 /* 296 * Enforce a hierarchy that gives slow devices a better chance at not 297 * dropping data. 298 */ 299 KASSERT(irqmasks[IPL_NONE] == ~0); 300 irqmasks[IPL_SOFTCLOCK] &= irqmasks[IPL_NONE]; 301 irqmasks[IPL_SOFTBIO] &= irqmasks[IPL_SOFTCLOCK]; 302 irqmasks[IPL_SOFTNET] &= irqmasks[IPL_SOFTBIO]; 303 irqmasks[IPL_SOFTSERIAL] &= irqmasks[IPL_SOFTNET]; 304 irqmasks[IPL_VM] &= irqmasks[IPL_SOFTSERIAL]; 305 irqmasks[IPL_CLOCK] &= irqmasks[IPL_VM]; 306 irqmasks[IPL_HIGH] &= irqmasks[IPL_CLOCK]; 307 } 308 309 310 void * 311 intr_claim(int irq, int level, int (*ih_func)(void *), void *ih_arg, const char *group, const char *name) 312 { 313 irqhandler_t *ih; 314 315 ih = malloc(sizeof(*ih), M_DEVBUF, M_NOWAIT | M_ZERO); 316 if (!ih) 317 panic("intr_claim(): Cannot malloc handler memory"); 318 319 ih->ih_level = level; 320 ih->ih_func = ih_func; 321 ih->ih_arg = ih_arg; 322 ih->ih_flags = 0; 323 324 if (irq_claim(irq, ih, group, name) != 0) 325 return(NULL); 326 327 return(ih); 328 } 329 330 int 331 intr_release(void *arg) 332 { 333 irqhandler_t *ih = (irqhandler_t *)arg; 334 335 if (irq_release(ih->ih_num, ih) == 0) { 336 free(ih, M_DEVBUF); 337 return(0); 338 } 339 return(1); 340 } 341 342 343 /* 344 * void disable_irq(int irq) 345 * 346 * Disables a specific irq. The irq is removed from the master irq mask 347 */ 348 349 void 350 disable_irq(int irq) 351 { 352 u_int oldirqstate; 353 354 oldirqstate = disable_interrupts(I32_bit); 355 current_mask &= ~(1 << irq); 356 irq_setmasks(); 357 restore_interrupts(oldirqstate); 358 } 359 360 361 /* 362 * void enable_irq(int irq) 363 * 364 * Enables a specific irq. The irq is added to the master irq mask 365 * This routine should be used with caution. A handler should already 366 * be installed. 367 */ 368 369 void 370 enable_irq(int irq) 371 { 372 u_int oldirqstate; 373 374 oldirqstate = disable_interrupts(I32_bit); 375 current_mask |= (1 << irq); 376 irq_setmasks(); 377 restore_interrupts(oldirqstate); 378 } 379 380 381 /* 382 * void stray_irqhandler(u_int mask) 383 * 384 * Handler for stray interrupts. This gets called if a handler cannot be 385 * found for an interrupt. 386 */ 387 388 void 389 stray_irqhandler(u_int mask) 390 { 391 static u_int stray_irqs = 0; 392 393 if (++stray_irqs <= 8) 394 log(LOG_ERR, "Stray interrupt %08x%s\n", mask, 395 stray_irqs >= 8 ? ": stopped logging" : ""); 396 } 397
Indexes created Mon Sep 29 21:09:56 GMT 2025